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This commit improves numerous functionalities of the OpenMP CMake build
system to be more conducive with LLVM's build system and build philosophies.
The CMake build system, as it was before this commit, was not up to LLVM's
standards and did not implement the configuration stage like most CMake based
build systems offer (check for compiler flags, libraries, etc.) In order to
improve it dramatically in a short period of time, a large refactoring had
to be done.
The main changes done with this commit are as follows:
* Compiler flag checks - The flags are no longer grabbed from compiler specific
directories. They are checked for availability in config-ix.cmake and added
accordingly inside LibompHandleFlags.cmake.
* Feature checks were added in config-ix.cmake. For example, the standard CMake
module FindThreads is probed for the threading model to use inside the OpenMP
library.
* OS detection - There is no longer a LIBOMP_OS variable, OS-specifc build logic
is wrapped around the WIN32 and APPLE macros with !(WIN32 OR APPLE) meaning
a Unix flavor of some sort.
* Got rid of vestigial functions/macros/variables
* Added new libomp_append() function which is used everywhere to conditionally
or undconditionally append to a list
* All targets have the libomp prefix so as not to interfere with any other
project
* LibompCheckLinkerFlag.cmake module was added which checks for linker flags
specifically for building shared libraries.
* LibompCheckFortranFlag.cmake module was added which checks for fortran flag
availability.
* Removed most of the cruft from the translation between the perl+Makefile based
build system and this one. The remaining components that they share are
perl scripts which I'm in the process of removing.
There is still more left to do. The perl scripts still need to be removed, and
a config.h.in file (or similarly named) needs to be added with #cmakedefine lines
in it. But this is a much better first step than the previous system.
Differential Revision: http://reviews.llvm.org/D10656
llvm-svn: 242298
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Cached CMake variables need to have a prefix so they don't collide with other
projects. This change (a lot of simple changes) simply prefixes cached variables
with LIBOMP_ and sets all of these variables to UPPERCASE which is convention.
e.g., os => LIBOMP_OS, ompt_support => LIBOMP_OMPT_SUPPORT.
Differential Revision: http://reviews.llvm.org/D9829
llvm-svn: 237845
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llvm-svn: 236746
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CMAKE buld system should meet everyone's requirements.
Enhanced CMake Build System Commit
* Supports Linux, Mac, Windows, and Intel® Xeon Phi builds
* Supports building with gcc, icc, clang, and Visual Studio compilers
* Supports bulding "fat" libraries on OS/X with clang
* Details and documentation on how to use build system
are in Build_With_CMake.txt
* To use the old CMake build system (corresponds to
CMakeLists.txt.old), just rename CMakeLists.txt to
CMakeLists.txt.other and rename CMakeLists.txt.old to
CMakeLists.txt
llvm-svn: 214850
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